Product classification
HS code for Nitrogen fertilizer (ammonium sulfate): 3102.21
Fertilizers, mineral or chemical, nitrogenous, ammonium sulphate.
Classification of nitrogen fertilizer (ammonium sulfate) under HS 3102.21
Ammonium sulfate fertilizer is classified under HS code 3102.21. This product is a nitrogenous mineral or chemical fertilizer. Within heading 3102, which covers nitrogenous fertilizers, subheading 3102.21 is specifically allocated to ammonium sulphate. This chemical compound is widely used in agriculture to provide both nitrogen and sulfur to crops. The classification is straightforward for pure ammonium sulfate intended for agricultural use. It is important to note that even if the product is of high purity (technical grade), if it is presented in a form or packaging for use as a fertilizer, it remains in Chapter 31. The Harmonized System prioritizes the chemical identity of the nitrogen source in this instance, distinguishing it from other nitrogenous compounds like urea or ammonium nitrate. This classification ensures that the specific nutrient profile of the fertilizer is recognized for both trade statistics and regulatory compliance.
- Covers
- Crystalline ammonium sulfate fertilizer
- Granular ammonium sulfate for soil application
- Ammonium sulfate used as a source of nitrogen and sulfur
- Also under 3102.21
- BASF Ammonium Sulphate
- Nutrien Ammonium Sulphate
- OCI Nitrogen Ammonium Sulphate
- EuroChem Ammonium Sulphate
Codes often confused with 3102.21
Common mistake. Ammonium sulfate (3102.21) can be confused with 3102.29, which covers other double salts and mixtures of ammonium sulfate and ammonium nitrate. Another common error is attempting to classify it under 2833.29, which is the general code for sulfates of other metals. However, Note 2 to Chapter 31 clarifies that heading 3102 applies to ammonium sulfate even if it is chemically pure, provided it is used as a fertilizer. Additionally, if the ammonium sulfate is mixed with other primary nutrients like potassium, it must be classified under heading 3105 as a compound fertilizer.
Top exporters and importers of HS 310221 (the code used for nitrogen fertilizer (ammonium sulfate)), 2025
In 2025, the largest exporter of HS 310221 (the code used for nitrogen fertilizer (ammonium sulfate)) in UN Comtrade data was China, with 74% of world exports; the largest importer in UN Comtrade data was Brazil, with 28% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 310221, not only nitrogen fertilizer (ammonium sulfate).
Top exporters 2025 · share of world exports
- 1 China $3.3B 74% of world exports
- 2 Belgium $294M 6.6% of world exports
- 3 Canada $178M 4.0% of world exports
World total: $4.5B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Brazil $1.4B 28% of world imports
- 2 United States $413M 8.1% of world imports
- 3 Türkiye $202M 4.0% of world imports
World total: $5.1B Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM code for nitrogen fertilizer (ammonium sulfate)
Brazil classifies nitrogen fertilizer (ammonium sulfate) under NCM 3102.21.00: HS 3102.21 with 00 added.
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
EU Regulatory Requirements
This product falls under the Carbon Border Adjustment Mechanism (CBAM). Importers to the EU must declare embedded carbon emissions and purchase CBAM certificates.
Questions about nitrogen fertilizer (ammonium sulfate)
What is the HS code for Nitrogen fertilizer (ammonium sulfate)?
The HS code for Nitrogen fertilizer (ammonium sulfate) is 310221 (Fertilizers, mineral or chemical; nitrogenous, ammonium sulphate). The specific HS code for ammonium sulfate used as a nitrogenous fertilizer is 3102.21.
How do I classify Nitrogen fertilizer (ammonium sulfate) for customs?
Nitrogen fertilizer (ammonium sulfate) is classified under HS code 310221 — Fertilizers, mineral or chemical; nitrogenous, ammonium sulphate. This is a 6-digit subheading level code.
Can ammonium sulfate be classified in Chapter 28?
Generally, no; if it is intended for use as a fertilizer, Chapter 31 (specifically 3102.21) takes precedence over the chemical headings in Chapter 28.
Which countries are the top exporters of nitrogen fertilizer (ammonium sulfate) (HS 310221)?
In 2025, the top exporters of HS 310221 (the code used for nitrogen fertilizer (ammonium sulfate)) in UN Comtrade data were China ($3.3B, 74% of world exports), Belgium ($294M) and Canada ($178M). World exports came to about $4.5B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of nitrogen fertilizer (ammonium sulfate) (HS 310221)?
In 2025, the top importers of HS 310221 (the code used for nitrogen fertilizer (ammonium sulfate)) in UN Comtrade data were Brazil ($1.4B, 28% of world imports), the United States ($413M) and Türkiye ($202M). World imports came to about $5.1B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Is the HS code for Nitrogen fertilizer (ammonium sulfate) the same in all countries?
The base HS code 310221 for Nitrogen fertilizer (ammonium sulfate) is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for nitrogen fertilizer (ammonium sulfate) in Brazil?
In Brazil, nitrogen fertilizer (ammonium sulfate) (HS 310221) is classified under NCM 3102.21.00.